1997 Ford F250 7.3L
Hello yalls, so I have a problem with my 1997 F250 HD 7.3L Powerstroke. I have a hard brake pedal on it. I replaced the brake booster as I thought that's what it was but it wasn't. I do have vacuum at the check valve so my vacuum pump is working. I do have the light on on the dash. My brakes get one good pedal push where it is soft but if I let off and push them again it gets hard. The booster came with a new check valve so I know that's not it. I am thinking it is a vacuum leak because I can not change what vent the air comes out either. Have any of you guys had this problem or maybe have a diagram of how the vacuum lines are ran. I work at a ford dealership and the workshop Manuel will not give me a diagram of the vacuum lines only for electrical. Any advice?